Fluid-pressure press



I gul w, 1929., w, B, UPDEGRAFF 1.721,421

FLUID PRES SURE PRES S Filed Feb. 27, 19 26 2 Sheets -Sheet l I 1|| I n INVENTOR July 16, 1929. w. B. UPDEGRAFF 1.721,421

FLUID PRESSURE PRES S Fiied Feb. 27, 1926 2 SheetS-Sheet 2 FIG-1-3.:-

' Mmesss INVENTOR Patented July 16, 1929.

WILLIAM B. nrnnen lrr,or 'm zh snrn, NEW JERSEY."

FLuIn-raEssUnn rnnss- Application filed February 27, 1926. Ser ial No. 91,124.

The object of my invention is toprovide means for developing;extremely high unit pressures on material tobe subjected to pressure, such as is required for pressing master dies into blanks, in the manufacture of dies, as used by jewelers, etc., for briquetting material confined between. phmgers in a suitable case, or female die; or for pressing. material together between platens or, plates, such as is common practice'inthe manuv facturing arts. It is usual to employ for such purposes, presses operated bymechanical means, and also presses operated by pneumatic or hydraulic fluid pressure.- 1

In mechanically operated f presses, there are limits in pressure availablefor use, due

to the safe bearing" pressures which can becrank fpins, eccentrics, also due to bend ng and shafts,v eccentric ,shafts,

applied to journals, p ntle bearings, etc., deflection of crank 1 etc. In the usual'type of crank, eccentric,

or pintle type mechanical presses, thejpressure is not uniform through the entire working stroke, and-this working stroke is' necessarily comparatively shorts In presses actuatedby air, water, or other fluid pressure, it. is possible to apply, in existing types, fairly high. unitpressure, and this pressure can beapplied uniformly through any given. length .of; -stroke or travel of the moving member of thepress; In existing types of hydraulic presses, the limitation of intensity of pressure isilargely' determined by'the allowable intensityofthe hydraulic or fluid pressure which can be exerted in the cylinder of the press. This limitation results from. the inability of leather, hemp, or other packing, to confine the fluid in the cylinder, and yet permit of relative motion between the ram and cyls inder. To increase the diameter or area-of the hydraulic ram, necessitates increasingthe lateral dimensions of the press, often to a prohibitive extent, and results in greatly increased weight and strength of platens, and consequently increased cost of press, and increased floor space, and usually re sults in increased deflection of platens, which is undesirable. Intensifying the unit by draulic pressure, above that usually carried in accumulator systems, is likewise objectionable, owing to the increased cost, floor space, etc., and also because by the use of intensifier, to increase t e accumulator pressure, the press ram stroke, travel, is

definitelydimited .by the limit ofvolumetric displacement of the ram or plunger of the intensifier. A further, and very important factor, which prevents the use of extremely high unit hydraulic pressure, is the difficulty in making cylinders sufficiently strong to resist :the,b ursting pressure exerted by the fluid; and also other difliculties, such as pump and valve troubles, etc. ;,..My ;inve'ntion"provides means whereby theunitpressure exerted, by the platens of a hydraulicupress, is practically doubled, withoutincreasing the area of the platens, and without. increasing the -fluid pressure. The improvement claimed ishereinafter fully set forth.

In the, accompanying drawings: Figure 1 is a verticalfcentral section, through a fluid pressurei press embodying any invention Fig;i52,ia view, in elevation', of the same, taken jatia right .angle to Fig.1; Fig. 3, a plan-ontopview; and, Figs 4 and 5, horizontal sections, on the lines a a and b b, respectively, of1 *ig.-1.' i

' In the practice ofmyinvention, referring descriptively to the specific embodiment thereof which -is herein exemplified, a hydraulic cylinder, 1, fitted with a ram, 2, is mounted :on, and-abuts against, a stationary platen, 3, with-which, if preferred, it may be cast integral. A fluid pressure pipe, 1, controlled, inthe usual manner, by a valve or valves, ,(no t shown), is connected to the cylindeig l -,The ram, 2, abuts against, and operates,;a moving, platen, 4, with which it may, be formed integral, and the stationary platen,-,3" ,;is connected to another stationary platem, 5, ;'located above it, by suitable tie rods, 8,-or equivalent tension members.- The structure above-described, provided with the usual packings, fluid passages, valves, etc., is substantially similar to hydraulic die presses of the type heretofore known,

my invention combines with it the members which will now be described.

A cylinder, 1, of substantially similar construction to the cylinder, 1, is mounted on the upper platen, 5, and a ram, 2 is fitted in the cylinder, 1, a suitable stuifing box, or other packing member, being provided. The ram, 2*, abuts against, or may be formed integral with, a oke, 6, which is connected, b tension rods, or equivalent members, to tli e lower movable platen, 4:. The material to be pressed is inserted in the space which intervenes between the movable platen, 4E, and the fixed upper; platen, 5," and the movable platen,--4,"is pushed "against the material by the lower ram, 2, and pulled, in the same direction, by the upper ram, 2 through the yoke, 6, and tension members, 7, the unit pressure exerted by the platenson the material to be pressed being thus practically double that which would be "exerted under like conditions, by one cylinder only. A fl uid pressure'pipe', 1, is connected to the cylinder, 1, and the usual 'channels, valves, etc.', for eonfining and controlling the supply and exl i'au'stof fluid toand from the cylinder, whic'hdo not form part of myfpresentinvention, are"not shown."

In-the' practical application of the inventi'on;fluid-pressure maybe admitted to either cylinder primarily, or to both cylinders simultaneouslyfand the cylinders and rams inay beiof the same, or of 'diflerent, diametersya n d m'ay bebperated at the same, or at different, unit hydraulie pressures. Pullback or pusliba'ck cylinders and rams, or any otliers'uitableknownmeans, may be applied, as desired, for opening the press after a presshrej stroke-has been made, that is to say, for separatingthe pl'atens, 4c and '5, and in so doing, expelling the fluid from the cylinders, l afnd 1i; fAnv' i' l'sfdies, or other auxiliary appliances, maybe attached to the platens, band 5, desired, to concentrate and apply the pressure developed bythe press cylinders, and througlrthe rams,- rods, platens, etc., to the material on whieh'the application of pressureis-des'ired. I

I claim asmy invention and desire to secure by 1 Letters Patent a "."Lln' a' fluid*pressure press, a stationary platen; a* pl'atenmovabletoward and from said'sationary platen, a fluid pressure cylinder disposedonthe-side of the stationary platen' that'isfarthestaway from the movable platen, affi'uid' pressure cylinder disposed on the side of themovable platen that isfa'rtlie'st awayfrom' the stationary platen, pistons in said cylinders, means operatively connecting said "pistons to said movable platen, and means for exerting fluid pressure in said cylinders to produce simultaneous forces in the' same directions acting on said movable platen." 1 i 1 21in a fluid pressure press, a stationary platen, a platen movable toward and from 3. In a fluid pressure press, a stationary.

platen, a platen movable toward and from said stationary platen, a fluid pressurecylinder disposed 'on' the side'pf the stationary platen that is farthest away from-the'inovable platen, and adapted to exert'thrust on said stationary platen, a fluid pressure cylinder disposed on the side "of the movable platen that is farthest awayjfromythe stationary platen, tension members connecting said second cylinder and said j'stationary platen, pistons in said cylinders, means; op: eratively connecting said pistons to sai d'mow able platen, and means forexertin'g fluid pressure in said cylinders to produce*al;si-

multaneous thrust in oppo sitedirectionson said stationary platen fromsaidl'cylinders and from the engagementfof-the movable platen and the work. f q

4. In a 'fluid pressure pressyastationary platen, a platen movable toward and from said stationary platen, a fluid pressure cylinder and piston disposed on the side of the stationary platen that is farthest awayjfrom the movableplaten, a fluid pressure cylinder disposed onthe'side ofthemovableplaten 7 that is-farthest away from the stationary platen, apiston'in saidcylinder adapted to exert thrust on said movable platen,'tension members operatively connecting the piston of said firstcylinder to said movable platen, means for exerting fluid pressure in said first specified cylinder whereby the moving platen is pulled toward the stationary platen, and means for exerting fluid pressure in second specified cylinder, thereby exerting a thrust on said moving platen, tending to move it toward the stationary platen.

9- W LIA iU D GRAF 

